Description: Twenty cases studies are presented that show how I-O psychologists create programs backed by theory and research to address real-world issues in organizations. The cases are diverse and cover several areas of the discipline: the selection of people for jobs, the development of leaders, the facilitation of inclusion and belongingness, as well as cases that show how technology is being deployed in our work, and how we can promote safe and healthy workplaces. These twenty case studies are supplemented by reflection chapters by some of the leading scholars in each of the five areas.